> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lerian.studio/llms.txt
> Use this file to discover all available pages before exploring further.

# Inbound messaging from BACEN

> How Lerian SPI receives the signed ISO 20022 messages that arrive from BACEN over the RSFN and applies them to its operations.

The ICOM consumer receives signed ISO 20022 messages from BACEN over the RSFN and passes them to the rail's authenticated internal ingress. A credit-transfer message (`pacs.008`) carries an inbound Pix. A status reply (`pacs.002`) reports a payment you sent. A return message (`pacs.004`) carries a devolução.

The rail validates each inbound message before it applies it. An outbound payment stays open until its `pacs.002` arrives. That reply applies `COMPLETED` or `REJECTED`. The rail records an inbound `pacs.008` as pending. The authenticated client's funding decision completes or refuses it. The rail records BACEN's fields verbatim.